Why is it important to document data sources and rationales for adjustments?

• A. For marketing purposes.
• B. For transparency, reproducibility, and to defend against bias or discrimination claims; supports USPAP compliance.
• C. To speed up the appraisal.
• D. To comply with lender reporting requirements only.

Answer: (B)

Documenting data sources and the rationale for adjustments is essential because it creates a transparent, reproducible basis for the appraiser’s conclusions. By recording where data come from—comparable sales, market data, property characteristics—and explaining how each adjustment was derived, you provide an auditable trail that others can review or replicate. This aligns with USPAP, which requires credible assignment results supported with documented information. The documentation also helps protect against bias or discrimination claims by showing adjustments are grounded in objective market data rather than subjective judgment. Clients and lenders benefit from a clear, defensible methodology, but the core purpose is to ensure credibility and compliance for any user of the report. Marketing or speed of the appraisal are not the primary reasons for this practice.